You can chase the chill with duct heaters manufactured by TPI. Model 4PD1010183 is 3 phase package duct heater having 480 V / 10 KW power and one control step. It has galvanized steel element rack and compartment. The heater comes with door interlock disconnect switch and differential pressure fan inter-lock switch. This unit includes 24 volt step down control transformer and definite purpose magnetic contactor.